PROTON HALO OF B-8 DISCLOSED BY ITS GIANT QUADRUPOLE-MOMENT

被引：259

作者：

MINAMISONO, T

OHTSUBO, T

MINAMI, I

FUKUDA, S

KITAGAWA, A

FUKUDA, M

MATSUTA, K

NOJIRI, Y

TAKEDA, S

SAGAWA, H

KITAGAWA, H

机构：

[1] OSAKA UNIV,FAC SCI,NUCL STUDIES LAB,TOYONAKA,OSAKA 560,JAPAN

[2] OSAKA UNIV,FAC SCI,DEPT CHEM,TOYONAKA,OSAKA 560,JAPAN

[3] UNIV TOKYO,FAC SCI,DEPT PHYS,BUNKYO KU,TOKYO 113,JAPAN

[4] OSAKA UNIV,NUCL PHYS RES CTR,IBARAKI,OSAKA 567,JAPAN

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.69.2058

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The quadrupole moment of the B-8 (I(pi) = 2+, T1/2 = 769 msec) nucleus was measured as \Q(B-8)\ = 68.3 +/- 2.1 mb by use of modified beta-NMR. This value is twice as large as the prediction of the Cohen-Kurath shell model. It is found by subtracting the contribution of deeply bound neutrons that the protons in B-8 carry more than 90% of the observed moment. The anomalous value is accounted for fairly well by the proton halo due to the loosely bound valence configuration. This is the first experimental evidence for the existence of a proton halo covering a neutron core.

引用

页码：2058 / 2061

页数：4

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